Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13a01139035566b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 06:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3eefbb29de0a957ae54edb75b5cd6628 SHA-1: 8002314a08b3e7f3309b01cd606bb7e23541ed60 SHA-256: c13a01139035566b67e0be76c0c9f0ad0a1bd5e46c3a74486fdc1cdec26e7f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or SEO abuse campaigns, often delivered via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://parcroyale.hk/userfiles/juxirelaturodukub.pdf In PDF document text
    • http://salt17.com/userfiles/files/59325096311.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/34406031682.pdfIn PDF document text
    • https://nls.vn/upload/files/82964350892.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/741097307.pdfIn PDF document text
    • https://alutat.com/data/file/durebegojapop.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/zavirobazuwamesibuzejak.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/sjrm2rv3ek2omgqe0tevoo0ml7/kexiguxuv.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/domipurove.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/rukivedowagojexovag.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/20431013385.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/62140171841.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/99018032263.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/tilirugubofimifiv.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/roleso.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135025447233---mejonulebuwopa.pdfIn PDF document text
    • http://aromata.ru/upload/files/nosekolivawumagorufivaz.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/48277393787.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c139aacde5ec3817fb7e1548b93139b8/16259598079.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/90743294045.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/kofepejosufevibam.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/87016808971.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/55705348513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cost+and+management+accounting+2+question+and+answer+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237503ac1a---2471220079.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 11400 bytes
SHA-256: 7d43bb32274ed9862e234248386fb8cbc7a7a57e4f4b24bbd188d3664a8c5d9f
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 16440 bytes
SHA-256: d231c2813c04080ea6eba0f7e0c01b056b95cbf0661cf84040cc741b23f8d1ac
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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